IWI US Hub-T Stainless Steel 5/8x24 Titanium. 37524) rear thread pattern. The inclusion of a taper surface for greater engagement between mount and silencer provides for a rock-solid attachment and the best efficiency and consistency for the muzzle and suppressor interface. IWI Silencers are reverse compatible with existing HUB systems. Check here for recommended HUB mounts. Specifications for IWI US HUB+ Direct Thread Adapter: Manufacturer: IWI US Fabric/Material: Stainless Steel Color: Titanium Threads per Inch: 5/8x24 Package Contents: IWI US HUB+ Direct Thread Adapter IWI HUB-T STAINLESS STEEL 5/8-24 IWSHUBSS24